CN105258888A - Research experiment apparatus and measurement method for influences of bearing interference on main shaft system performance - Google Patents
Research experiment apparatus and measurement method for influences of bearing interference on main shaft system performance Download PDFInfo
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Abstract
The invention provides a research experiment apparatus and a measurement method for influences of bearing interference on main shaft system performance. An upper part of an experiment main shaft mainly comprises a pair of angular contact ball bearings installed in a back-to-back manner, a locking nut and a space ring. The magnitude of interference between a main shaft and a bearing is changed by using micron-grade shims of different thicknesses between the main shaft and a cooperation surface of a bearing inner ring. An end part of the main shaft is provided with an axial load and a radial load to simulate machining conditions of the main shaft. Static rigidity, rotation precision, temperature rise and vibration of the main shaft system under different magnitudes of interference can be tested, and the modal characteristic of the main shaft system can be tested through a hammering method. The structure of the main shaft system is simplified, influences of other assembly parameters on the shaft system performance can be eliminated, and rules of influences of bearing interference on the main shaft system performance can be tested comprehensively and conveniently.
Description
Technical field
The present invention relates to a kind of bearing magnitude of interference to the research experiment device of axis system performance impact and measuring method, be specifically related to the implementation of interference fit parameter in experimental provision considering different bearing inner races and main shaft, and method of testing is tested to performances such as the axis system Static stiffness in different value of interference fit situation, bearing outer ring temperature, axle system rotating accuracy, spindle vibration, natural frequencys by experiment.
Background technology
In high-speed main spindle-bearing arrangement, bearing inner race and main shaft adopt interference fit to be connected, and its structure is simple on the one hand, centering precision can be made higher on the other hand.But, choosing of value of interference fit size is relevant with the processing operating mode (as the speed of mainshaft, cutting force, cutting speed etc.) residing for axis system, along with the change of machine tool chief axis processing operating mode, under the combined influence of the factor such as centrifugal effect and thermal effect, main shaft and bearing inner race all can deform, cause the two connection status to change, affect the processing characteristics of axle system further.The magnitude of interference chooses the excessive assembling difficulty often making main shaft and bearing, even causes the damage of the two mating surface; And the magnitude of interference is chosen and too smallly can be caused getting loose of main shaft and bearing, causes mating surface to skid, causes the problem such as shafting vibration, temperature rise increase.Therefore, need to study the quantitative selection of main shaft and the bearing inner race magnitude of interference.
Comparatively be short of in the experimental provision and testing research of spindle rotor and the bearing inner race magnitude of interference at present, lack the experimental provision analyzed for magnitude of interference shaft performance impact, be difficult to carry out systematic study to the affecting laws of magnitude of interference change shaft performance.
Summary of the invention
The object of the present invention is to provide a kind of bearing magnitude of interference to the research experiment device of axis system performance impact and measuring method.
To achieve these goals, present invention employs following technical scheme:
A kind of bearing magnitude of interference is to the research experiment device of axis system performance impact, this experimental provision comprises electro spindle, bearing seat, magnitude of interference experiment main shaft and the detection module for testing axis system performance, described magnitude of interference experiment main shaft is provided with the angular contact ball bearing installed back-to-back for a pair, magnitude of interference experiment main shaft is supported in bearing seat by the angular contact ball bearing that described a pair is installed back-to-back, the side of the described angular contact ball bearing installed back-to-back for a pair is provided with the set nut of to test main shaft with the magnitude of interference and being connected, the arranged outside of set nut has the detachable end be connected with one end of bearing seat, described end cap and set nut hold out against from one end of described bearing seat the outer ring of the angular contact ball bearing that described a pair is installed back-to-back and inner ring respectively, the opposite side of the described angular contact ball bearing installed back-to-back for a pair is provided with the spacer ring of to test main shaft with the magnitude of interference and being connected, one end of spacer ring be arranged at the shaft shoulder that the magnitude of interference tests on main shaft and contact, the other end of spacer ring contacts with the inner ring of the angular contact ball bearing to install back-to-back for described a pair, the shoulder block being arranged at the other end of bearing seat contacts with the outer ring of the angular contact ball bearing to install back-to-back for described a pair, one end of magnitude of interference experiment main shaft is provided with the flange for connecting electro spindle, the other end of magnitude of interference experiment main shaft is provided with hydraulic cylinder or power hammer for applying radial force to magnitude of interference experiment main shaft, micrometre grade thin pad is provided with between magnitude of interference experiment main shaft and the inner ring mating surface of the described angular contact ball bearing installed back-to-back for a pair, in order to simplify axis system structure, get rid of the impact of other assembly parameter shaft performances, experiment main axis length is shorter, axle upper-part mainly comprise a pair back-to-back form install angular contact ball bearing, a set nut and a spacer ring, and when testing main shaft and installing from bearing according to the magnitude of interference requirement of different size, at the micrometre grade thin pad of the replaceable use different-thickness of installing positions of bearings of experiment main shaft, make the magnitude of interference of main shaft and bearing in axis system variable.
The axis system performance test that described experimental provision can carry out comprises Static stiffness test, the rotating accuracy test of axle system, characteristics of mode test, vibration-testing and bearing temperature test.
Described detection module comprises temperature sensor, three-dimensional acceleration transducer, capacitance displacement sensor and clock gauge; Bearing seat radially offers two through holes, in two through holes, is respectively arranged with temperature sensor, be convenient to the temperature rise directly testing former and later two bearing places; Three-dimensional acceleration transducer to be arranged on bearing seat top (the shafting vibration situation in test experiments spindle operation process) or to be arranged at magnitude of interference experiment main shaft, and the contact point that three-dimensional acceleration transducer and the magnitude of interference test main shaft is positioned at described power and hammers the offside of the magnitude of interference being tested to main shaft beating point into shape; The shaft part circumference of magnitude of interference experiment main shaft is provided with three capacitance displacement sensors, for testing axle system rotating accuracy; The contact point that clock gauge and the magnitude of interference test main shaft is positioned at the offside that described hydraulic cylinder and the magnitude of interference test the contact point of main shaft.
The support that described experimental provision also comprises cast iron platform and is connected with bearing seat, experimentally concrete test request, bearing seat is by described support installing on cast iron platform relevant position, and electro spindle and hydraulic cylinder are arranged on cast iron platform.
Described spacer ring is stepped, leaves gap between the circumference of spacer ring and bearing seat, and set nut is used for angular contact ball bearing described in axial location, and can lock nut carries out pretension to bearing to spacer ring on the one hand, plays the effect of auxiliary dismounting bearing on the other hand.
Cageless between two bearings of the described angular contact ball bearing installed back-to-back for a pair.
Based on the above-mentioned bearing magnitude of interference to the bearing magnitude of interference of the research experiment device of axis system performance impact to a measuring method for axis system performance impact, comprise the following steps:
Change the described magnitude of interference by using the micrometre grade thin pad of different-thickness between described magnitude of interference experiment main shaft and the mating surface of the described angular contact ball bearing inner ring installed back-to-back for a pair and test magnitude of interference size between main shaft and the described angular contact ball bearing installed back-to-back for a pair, then described electro spindle or hydraulic cylinder is utilized to apply axial load or radial load with analog main shaft cut operating mode at described magnitude of interference experiment spindle nose, then the Static stiffness of different magnitude of interference lower main axis system is tested, rotating accuracy, bearing temperature rise and vibration, simultaneously, described power is utilized to hammer the characteristics of mode being tested corresponding magnitude of interference lower main axis system by hammering method into shape, thus obtain the bearing magnitude of interference to the rule of axis system performance impact.
When changing described magnitude of interference size, first described end cap is opened, dismantle described set nut again, then the angular contact ball bearing using bearing puller to install described a pair back-to-back goes out bearing seat along magnitude of interference experiment mainshaft, then the micrometre grade thin pad of different-thickness is changed, micrometre grade thin pad after replacing is adsorbed on magnitude of interference experiment main shaft, bearing seat is returned on the angular contact ball bearing top of then installing described a pair back-to-back in conjunction with hot charge practice, then reinstalls described set nut and end cap, or, when changing described magnitude of interference size, first described end cap is opened, dismantle described set nut again, then direct bearing seat to be taken apart, then the magnitude of interference is tested main shaft and the described angular contact ball bearing installed back-to-back for a pair takes out in the lump, then the angular contact ball bearing installed described a pair back-to-back and the magnitude of interference are tested main shaft and are separated, then the micrometre grade thin pad of different-thickness is changed, micrometre grade thin pad after replacing is adsorbed on magnitude of interference experiment main shaft, then hot charge practice is adopted to be reinstalled by the angular contact ball bearing that described a pair is installed back-to-back on magnitude of interference experiment main shaft, then be reinstalled bearing seat and described set nut and end cap are installed.
In described Static stiffness test, the radial displacement of magnitude of interference experiment main shaft is obtained by clock gauge measurement, and the loading force relative with clock gauge direction of measurement is provided by described hydraulic cylinder; In described rotating accuracy test, electro spindle drive shaft system is utilized to operate, use three capacitance displacement sensors in axis system operation process, measure the radial displacement of magnitude of interference experiment main shaft, and adopt three point method to carry out analyzing and processing to measurement data, obtain the rotating accuracy of axis system; In the test of described bearing temperature rise, by two through holes that bearing seat is offered, the outer ring of temperature sensor with the angular contact ball bearing to install back-to-back for described a pair contact, thus the temperature rise of real-time measurement bearing outer ring; In described vibration-testing, electro spindle drive shaft system is utilized to operate, the vibration signal of axis system operation process is obtained by the three-dimensional acceleration transducer be arranged on bearing seat top, by processing vibration signal, obtains vibration amplitude and the vibration frequency of axis system; In described characteristics of mode test, use described power hammer to carry out radial direction at the offside of three-dimensional acceleration transducer to magnitude of interference experiment main shaft to knock, and obtain power hammer pumping signal and acceleration transducer response signal by LMS data acquisition system (DAS), by data analysis, obtain the frequency response function of axis system; By changing the position of three-dimensional acceleration transducer, obtaining the frequency response function of axis system difference, then adopting lumped-parameter method to obtain natural frequency and the Mode Shape of axis system.
Beneficial effect of the present invention is embodied in:
Test in the present invention main shaft upper-part mainly comprise a pair back-to-back form install angular contact ball bearing, a set nut and a spacer ring, conveniently can adjust the magnitude of interference of bearing inner race and main shaft, for the quantitative calculating of the magnitude of interference or optimal design provide experiment test device, contribute to the Rational choice of bearing and main shaft work-in parameters, avoid traditional utilizing experience to determine the problem existing for the bearing magnitude of interference, such as main shaft performance cannot arrive optimization.The present invention can carry out performance test comprehensively and accurately to the axis system in different magnitude of interference situation, comprise axis system Static stiffness, bearing outer ring temperature, axle system rotating accuracy, spindle vibration, natural frequency etc., test result can provide reference for the affecting laws research of the magnitude of interference to axis system.
Accompanying drawing explanation
Fig. 1 is main shaft bearing magnitude of interference test main axle structure schematic diagram;
Fig. 2 is main shaft bearing magnitude of interference experiment test system schematic diagram;
Fig. 3 is that main shaft and the bearing inner race magnitude of interference change schematic diagram;
Fig. 4 is different magnitude of interference lower main axis system Static stiffness test schematic diagram; Wherein: a is stereographic map; B is the front-end of spindle side view of a;
Fig. 5 is different magnitude of interference lower main axis system rotating accuracy test schematic diagram;
Fig. 6 is different magnitude of interference lower main axis system mode characteristic test schematic diagram;
Fig. 7 is different magnitude of interference lower main axis system vibration test schematic diagram;
Fig. 8 is different magnitude of interference lower main axis system bearings temperature test schematic diagram; Wherein: a is stereographic map; B is the cut-open view of a;
In figure: 1-magnitude of interference experiment main shaft; 2-set nut; 3-end cap; 4-screw; 5-bearing seat; 6-angular contact ball bearing; 7-spacer ring; 8-cast iron platform; 9-support; 10-electro spindle; 11-micrometre grade thin pad; 12-clock gauge; 13-hydraulic cylinder; 14-capacitance displacement sensor; 15-three-dimensional acceleration transducer; 16-temperature sensor; 17-flange.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
The invention provides a kind of bearing magnitude of interference to the research experiment device of axis system performance impact and measuring method, changing magnitude of interference size between main shaft and bearing by using the micrometre grade thin pad of different-thickness between main shaft and the mating surface of bearing inner race.Apply axial load, radial load analog main shaft cut operating mode at spindle nose, test the Static stiffness of different magnitude of interference lower main axis system, rotating accuracy, temperature rise and vibration, and by hammering method test axis system characteristics of mode.
As depicted in figs. 1 and 2, the described bearing magnitude of interference is to the research experiment device of axis system performance impact, comprise with lower module: cast iron platform 8, drive with electro spindle 10 and servo drive system thereof and lubricating and cooling system, test axis system, axial loading system (electro spindle 10), radial loaded system (hydraulic cylinder 13 and power hammer) and axis system Performance Test System (comprising corresponding sensor).
(1) main shaft and the test of bearing value of interference fit are tested main shaft (test axis system) and are arranged on cast iron platform 8, and test axis system comprises following parts: magnitude of interference experiment main shaft 1,2 angular contact ball bearings 6, spacer ring 7, bearing seat 5, set nut 2 and end caps 3.Its assembly relation is as follows: the Bearing configuration of magnitude of interference experiment main shaft 1 selects the simplest two to support back-to-back Bearing configuration form, to eliminate other assembling factors as far as possible to the impact of value of interference fit (magnitude of interference).Nose angle contact ball bearing 6 and the magnitude of interference are tested between main shaft 1 shaft shoulder and are used the stepped short spacer ring 7 (inside diameter is little, and outside diameter is large, there is gap with bearing seat) of tool, are convenient to the bearing removal in experimentation.2 angular contact ball bearings 6 are tested main shaft 1 with the magnitude of interference and are fixed by the set nut 2 of rear end, form spindle bearing system parts, spindle bearing system parts are installed to (usual level installation) in bearing seat 5, be fixed by the end cap 3 of bearing seat 5 rear end, and tighten with screw 4, thus forming described test axis system, magnitude of interference experiment main shaft 1 rear end has flange 17, for being connected with the front end flange of electro spindle 10.
(2) in order to test axis system performance, respective sensor arranged by experimental provision.Specifically details are as follows: bearing seat 5 radially has two apertures for mounting temperature sensor 16, corresponding two centers of angular contact ball bearing 6 on width (axis) of axial location in hole, are convenient to the temperature rise situation of directly testing front-and-back angle contact ball bearing place; At magnitude of interference experiment main shaft 1 shaft part circumferentially three capacitance displacement sensors 14 foremost, for measuring the axle system rotating accuracy under different value of interference fit; Three-dimensional acceleration transducer 15 can be installed in bearing seat 5 top, for testing the shafting vibration situation in different value of interference fit lower main axis system operation process, this three-dimensional acceleration transducer 15 also can be arranged on the diverse location of magnitude of interference experiment main shaft 1 front end, the radial direction of coordinate force hammer to magnitude of interference experiment main shaft 1 is knocked, and realizes the test of the characteristics of mode such as natural frequency; Magnitude of interference experiment main shaft 1 front end also can arrange clock gauge 12, coordinates with hydraulic cylinder 13, realizes Static stiffness test.In a word, whole experimental provision can carry out the performance tests such as axis system Static stiffness, bearing outer ring temperature, axle system rotating accuracy, spindle vibration, natural frequency.
In order to the magnitude of interference realizing main shaft and angular contact ball bearing 6 in axis system is variable, in installation process, according to the demand of actual experiment test to the magnitude of interference, between main shaft and angular contact ball bearing 6 inner ring, use the micrometre grade thin pad 11 of different-thickness, as shown in Figure 3.In experimentation, the micrometre grade thin pad 11 of different-thickness need be changed, to realize the different value of interference fit of angular contact ball bearing 6 and main shaft.Its concrete dismounting mode is as follows: during assembling, the installation form of a pair (2) angular contact ball bearing 6 on magnitude of interference experiment main shaft 1 is back-to-back, micrometre grade thin pad (adopting aviation kerosene to be adsorbed on main shaft) is wound around by circumference on magnitude of interference experiment main shaft 1, again 2 angular contact ball bearings 6 are tested main shaft 1 with hot charging form and the magnitude of interference to assemble, and by set nut 2,2 angular contact ball bearings 6 are axially fixed on magnitude of interference experiment main shaft 1, micrometre grade thin pad 11 is tested between the mating surface of main shaft 1 at angular contact ball bearing 6 and the magnitude of interference, form spindle bearing system parts.Spindle bearing system parts entirety is loaded bearing seat 5, and is axially positioning with the shoulder block of bearing seat front end, finally adopt in rear end end cap 3 to compress, and tighten fixing with screw 4.When needs change the magnitude of interference, first rear end end cap 3 is opened, dismantle set nut 2 again, then bearing puller is used to be ejected by 2 angular contact ball bearings 6, change the micrometre grade thin pad 11 of different-thickness, and then repetition assembling process, thus change the pad of different-thickness, to reach the testing requirement of different magnitude of interference lower shaft systems performance in experimentation.
In axis system Static stiffness test process, as shown in Figure 4, use hydraulic cylinder 13 pairs of magnitude of interference experiment main shaft 1 front end shaft parts to carry out the applying of radial force, the radial displacement of this main shaft measured by the clock gauge 12 simultaneously by being arranged on magnitude of interference experiment main shaft 1 front end.Radial displacement according to measured magnitude of interference experiment main shaft 1 applies power with the radial direction read, and carries out the calculating of axis system Static stiffness.Repeatedly test and average, obtain the Static stiffness of axis system.Experimentally need, the axle system Static stiffness under the different magnitude of interference is tested, obtains the affecting laws of magnitude of interference shaft Static stiffness.
In axis system rotating accuracy test process, as shown in Figure 5, (driven by electro spindle 10) in axis system operation process, use the front end radial displacement of capacitance displacement sensor 14 pairs of magnitude of interference experiment main shafts 1 to test.Three capacitance displacement sensors are arranged in the circumferential position of magnitude of interference experiment main shaft 1 front end shaft part, by data actuation Real-time Collection and record the magnitude of interference experiment main shaft 1 front end radial displacement, finally adopt three point method to measured data analysis process, obtain the axle system rotating accuracy in different magnitude of interference situation.
In axis system characteristics of mode test process, as shown in Figure 6, first three-dimensional acceleration transducer 15 is arranged on magnitude of interference experiment main shaft 1 front end, make firmly hammer carry out radial direction at the offside of three-dimensional acceleration transducer 15 to magnitude of interference experiment main shaft 1 to knock, the response signal of power hammer pumping signal and acceleration transducer is obtained by LMS data acquisition system, by data analysis, obtain the frequency response function of axis system; And then by changing the position of three-dimensional acceleration transducer 15 on magnitude of interference experiment main shaft 1, repeat frequency response function to measure, the response of magnitude of interference experiment main shaft 1 difference can be obtained, then adopt lumped-parameter method, natural frequency and the Mode Shape of axis system can be obtained.Experimentally need, the axle system characteristics of mode under the different magnitude of interference is tested, obtains the affecting laws of magnitude of interference shaft characteristics of mode.
In spindle system vibration test process, as shown in Figure 7, in axis system operation process, obtained the vibration signal of axis system by the three-dimensional acceleration transducer 15 be arranged on bearing seat 5, comprise axial vibration and two orthogonal radial vibration signals of magnitude of interference experiment main shaft 1.By carrying out analyzing and processing to the vibration signal gathered in different magnitude of interference situation, vibration amplitude and the vibration frequency situation of different magnitude of interference situation lower main axis system can be obtained, thus the affecting laws situation of the magnitude of interference to the vibration amplitude of axis system and vibration frequency can be obtained.
In bearing outer ring temperature test process, as shown in Figure 8, two temperature sensors 16 are arranged on respectively in two apertures that bearing seat 5 is offered, temperature sensor directly can contact with the outer ring of two angular contact ball bearings 6, in axis system operation process, can the temperature rise situation at the different magnitude of interference situation lower main axis system bearings place of survey record in real time, obtain the affecting laws of magnitude of interference shaft temperature.
Claims (9)
1. a bearing magnitude of interference is to the research experiment device of axis system performance impact, it is characterized in that: this experimental provision comprises electro spindle (10), bearing seat (5), magnitude of interference experiment main shaft (1) and the detection module for testing axis system performance, described magnitude of interference experiment main shaft (1) is provided with the angular contact ball bearing (6) installed back-to-back for a pair, magnitude of interference experiment main shaft (1) is supported in bearing seat (5) by the angular contact ball bearing (6) that described a pair is installed back-to-back, the side of the described angular contact ball bearing (6) installed back-to-back for a pair is provided with the set nut (2) of to test main shaft (1) with the magnitude of interference and being connected, the arranged outside of set nut (2) has the detachable end (3) be connected with one end of bearing seat (5), described end cap (3) and set nut (2) hold out against from one end of described bearing seat (5) to the outer ring of the angular contact ball bearing (6) that described a pair is installed back-to-back and inner ring respectively, the opposite side of the described angular contact ball bearing (6) installed back-to-back for a pair is provided with the spacer ring (7) of to test main shaft (1) with the magnitude of interference and being connected, one end of spacer ring (7) be arranged at the shaft shoulder that the magnitude of interference tests on main shaft (1) and contact, the other end of spacer ring (7) contacts with the inner ring of the angular contact ball bearing (6) to install back-to-back for described a pair, the shoulder block being arranged at the other end of bearing seat (5) contacts with the outer ring of the angular contact ball bearing (6) to install back-to-back for described a pair, one end of magnitude of interference experiment main shaft (1) is provided with the flange (17) for connecting electro spindle (10), hydraulic cylinder (13) or power that the other end of magnitude of interference experiment main shaft (1) is provided with for applying radial force to magnitude of interference experiment main shaft (1) are hammered into shape, micrometre grade thin pad (11) is provided with between magnitude of interference experiment main shaft (1) and the inner ring mating surface of the described angular contact ball bearing (6) installed back-to-back for a pair.
2. a kind of bearing magnitude of interference, to the research experiment device of axis system performance impact, is characterized in that according to claim 1: the axis system performance test that described experimental provision can carry out comprises Static stiffness test, the rotating accuracy test of axle system, characteristics of mode test, vibration-testing and bearing temperature test.
3. a kind of bearing magnitude of interference, to the research experiment device of axis system performance impact, is characterized in that according to claim 1: described detection module comprises temperature sensor (16), three-dimensional acceleration transducer (15), capacitance displacement sensor (14) and clock gauge (12); Bearing seat (5) radially offers two through holes, in two through holes, is respectively arranged with temperature sensor (16); Three-dimensional acceleration transducer (15) is arranged on bearing seat (5) top or is arranged on magnitude of interference experiment main shaft (1), and the contact point that three-dimensional acceleration transducer (15) and the magnitude of interference test main shaft (1) is positioned at described power and hammers the offside of the magnitude of interference being tested to main shaft (1) beating point into shape; The shaft part circumference of magnitude of interference experiment main shaft (1) is provided with three capacitance displacement sensors (14); The contact point that clock gauge (12) and the magnitude of interference tests main shaft (1) is positioned at the offside that described hydraulic cylinder (13) and the magnitude of interference test the contact point of main shaft (1).
4. according to claim 1 a kind of bearing magnitude of interference to the research experiment device of axis system performance impact, it is characterized in that: the support (9) that described experimental provision also comprises cast iron platform (8) and is connected with bearing seat (5), described support (9), electro spindle (10) and hydraulic cylinder (13) are arranged on cast iron platform (8).
5. according to claim 1 a kind of bearing magnitude of interference to the research experiment device of axis system performance impact, it is characterized in that: described spacer ring (7), for stepped, leaves gap between the circumference of spacer ring (7) and bearing seat (5).
6. a kind of bearing magnitude of interference, to the research experiment device of axis system performance impact, is characterized in that according to claim 1: cageless between the described angular contact ball bearing (6) installed back-to-back for a pair.
7. based on the bearing magnitude of interference described in claim 1 to the bearing magnitude of interference of the research experiment device of axis system performance impact to a measuring method for axis system performance impact, it is characterized in that: comprise the following steps:
Change the described magnitude of interference by using the micrometre grade thin pad (11) of different-thickness between described magnitude of interference experiment main shaft (1) and the mating surface of described angular contact ball bearing (6) inner ring installed back-to-back for a pair and test magnitude of interference size between main shaft (1) and the described angular contact ball bearing (6) installed back-to-back for a pair, then described electro spindle (10) or hydraulic cylinder (13) is utilized to apply axial load or radial load in described magnitude of interference experiment main shaft (1) end with analog main shaft cut operating mode, then the Static stiffness of different magnitude of interference lower main axis system is tested, rotating accuracy, bearing temperature rise and vibration, simultaneously, described power is utilized to hammer the characteristics of mode being tested corresponding magnitude of interference lower main axis system by hammering method into shape, thus obtain the bearing magnitude of interference to the rule of axis system performance impact.
8. method according to claim 7, it is characterized in that: when changing described magnitude of interference size, first described end cap (3) is opened, dismantle described set nut (2) again, then the angular contact ball bearing (6) using bearing puller to install described a pair back-to-back ejects bearing seat (5) along magnitude of interference experiment main shaft (1), then the micrometre grade thin pad (11) of different-thickness is changed, micrometre grade thin pad (11) after replacing is adsorbed on magnitude of interference experiment main shaft (1), then the angular contact ball bearing (6) installed described a pair back-to-back in conjunction with hot charge practice pushes up back bearing seat (5), then described set nut (2) and end cap (3) is reinstalled, or, when changing described magnitude of interference size, first described end cap (3) is opened, dismantle described set nut (2) again, then direct bearing seat (5) to be taken apart, then the magnitude of interference is tested main shaft (1) to take out in the lump with the described angular contact ball bearing (6) installed back-to-back for a pair, then angular contact ball bearing (6) and the magnitude of interference installed described a pair are back-to-back tested main shaft (1) and are separated, then the micrometre grade thin pad (11) of different-thickness is changed, micrometre grade thin pad (11) after replacing is adsorbed on magnitude of interference experiment main shaft (1), then the angular contact ball bearing (6) adopting hot charge practice to install described a pair back-to-back reinstalls on magnitude of interference experiment main shaft (1), then be reinstalled bearing seat (5) and described set nut (2) and end cap (3) are installed.
9. method according to claim 7, it is characterized in that: in described Static stiffness test, the radial displacement of magnitude of interference experiment main shaft (1) is measured by clock gauge (12) and is obtained, and the loading force relative with clock gauge (12) direction of measurement is provided by described hydraulic cylinder (13); In described rotating accuracy test, electro spindle (10) drive shaft system is utilized to operate, use three capacitance displacement sensors (14) in axis system operation process, measure the radial displacement of magnitude of interference experiment main shaft (1), and adopt three point method to carry out analyzing and processing to measurement data, obtain the rotating accuracy of axis system; In the test of described bearing temperature rise, by two through holes that bearing seat is offered, the outer ring of temperature sensor (16) with the angular contact ball bearing (6) to install back-to-back for described a pair contact, thus the temperature rise of real-time measurement bearing outer ring; In described vibration-testing, electro spindle (10) drive shaft system is utilized to operate, the vibration signal of axis system operation process is obtained by the three-dimensional acceleration transducer (15) be arranged on bearing seat (5) top, by processing vibration signal, obtain vibration amplitude and the vibration frequency of axis system; In described characteristics of mode test, use described power to hammer into shape to test main shaft (1) at the offside of three-dimensional acceleration transducer (15) to the magnitude of interference and carry out radial direction and knock, and obtain power hammer pumping signal and acceleration transducer response signal by LMS data acquisition system (DAS), by data analysis, obtain the frequency response function of axis system; By changing the position of three-dimensional acceleration transducer (15), obtaining the frequency response function of axis system difference, then adopting lumped-parameter method to obtain natural frequency and the Mode Shape of axis system.
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| CN113607416A (en) * | 2021-08-04 | 2021-11-05 | 大连工业大学 | Rolling bearing three-dimensional dynamic stiffness test device and test method thereof |
| CN113607416B (en) * | 2021-08-04 | 2023-05-30 | 大连工业大学 | Rolling bearing three-dimensional dynamic stiffness test device and test method thereof |
| CN114453974A (en) * | 2022-03-10 | 2022-05-10 | 兰州理工大学 | Device and method for testing dynamic interference variation of interference connection between motor rotor and main shaft |
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